add Slice_RLHT, Slice_THRM_31855, and Slice_THRM_31856 to projects page

Author: CameronBrooks11

_pages/projects.md

@@ -13,6 +13,9 @@ The FEAST ecosystem consists of several project repositories that provide tools,
 Additional project pages, hosted standalone, can be accessed via their corresponding GitHub Pages sites:
 
 - [Slice_DCMT](/Slice_DCMT/)
+- [Slice_RLHT](/Slice_RLHT/)
+- [Slice_THRM_31855](/Slice_THRM_31855/)
+- [Slice_THRM_31856](/Slice_THRM_31856/)
 - [can-nano-shield](/can-nano-shield/)
 - [can-nano-shield-fieldbus](/can-nano-shield-fieldbus/)
 - [Slice_TEMP_NANO_S2L-r1](/Slice_TEMP_NANO_S2L-r1/)